ascotm‘s np operating experience

Emerson Confidential

ASCOTM‘s NP Operating Experience

and NP-G/H Series Updates

Presented By:

Steve Casadevall, Nuclear Engineering Manager

Nick Ingles, Sr. Product Engineer

Agenda

2Emerson Confidential

Some of ASCOTM’s Operating Experience from the Past Several Years

Introduction of the NP-G/H Series (NP with RedHat ll Epoxy Coils)

EP, Screw Terminal, HS Clip

Catalog Codification

Qualification Life Comparison

8300/8342 DC Series Update

Questions from Utilities

Some of ASCOTM’s

Operating Experience

From the Past Several Years

ASCOTM’s Operating Experience – Air System


EPDM is susceptible to oil based chemical attacks, this causes the material to breakdown, leads to sticking, degradation issues

Rubber EPDM

material

left on seat

Disc degraded

with material

missing/White spots

ASCOTM’s Operating Experience - FME


Debris can get in-between sealing surfaces, causing system leaks

Debris can jam the valve and Loctite can plug bleed holes

ASCOTM’s Operating Experience – Electrical


Acetic Acid reacts with the lead solder & turns into

Lead Acetate then decays into lead carbonate

which is a salt

The lead salt doesn’t conduct electricity very well,

which leads to arcing and coil lead damage

Acetic Acid (vinegar) cured RTV can damage

soldering leads

Introduction of the

NP-G/H series (NP with RedHat ll Epoxy Coils)

ASCOTM Nuclear Product Evolution


IEE

E

AP

10

00

NP8316

NT8316 NT LINE EXT

8316 “& 8320

Developed 1978

• EPDM/FKM

elastomers

• Non-molded

varnish coils

Developed 2011

• For AP1000

applications

• Red Hat II

Coil with

built in diode

8316’s as examples

Le

ve

ls

& IE

EE

Developed 1995

• elastomeric

compound developed

by ASCO - Better

radiation resistance,

longer thermal life

• Molded Coil

NS8316

Developed 2015

• Red Hat II Coil

with or w/o

diode.

• New Quick

Disconnect

"New” NP-’G/H’

Next SOV for utilities

- 2017

• Drop-in replacement

for NP series

• EPDM/FKM

Elastomers

• Red Hat II Epoxy

Coil for longer coil life

ASCOTM NP-G/H Series Overview

Emerson Confidential 9

RHII Coil replacement – SBSA and Coil change

The NP ‘G’ valve will be qualified (AQR-100368) by extension for the Coil only and the Pressure Vessel remains qualified under the legacy qualification programs

– Qualification by extension for coil per IEEE specification and ASCO Reports: AQR 35115 and NT Line Extension AQR 35115-3

– The pressure vessel is qualified under ASCO reports AQR-67368 , AQR 21691

Same magnet wire coil system, but embedded in epoxy plastic.

Same threaded connection to valve.



¾” conduit adapter with Fiberglass leads

and a ground wire

DC 17.4 watt coils will

switch to a 14.6 watt RHII

coil

All AC valves will switch

over to the same wattage

RHII Coil

QDC (quick dis-connect)

will be an option instead of

screw terminal

Include all series, 8300(AC), 8314, 8316,

8320, 8321, 8342(AC), & 8344 - DROP IN

REPLACEMENT

• RHII coil was qualified on our NT8316

& NT8320 valves to AP1000 and IEEE

specifications.

• ASCO has over 30 years of experience

with the RedHat II coil system in

commercial applications

EP, Screw Terminal,

HS Clip

ASCOTM NP-G/H Series EP details


Explosion proof on the NP legacy series is the ability of the solenoid system to not cause an explosion in

an explosive atmosphere. This was limited to certain environments and didn’t include hydrogen.

ASCO is offering NP-G/H series valves with a non-resettable thermal fuse, but the qualification would be

limited to areas where the valve is not required to operate during or after a LOCA event, and if it is

required, it is limited to a maximum ambient accident temperature of 180°C.

ASCOTM NP-G/H Series Conduit details


A ½” to ¾” conduit adapter is attached to the coils to provide native ¾” conduit connection for easy connection to the existing ¾” conduit on the legacy NP series valves.

Qualtech QDC

ASCO QDC

The screw terminal junction box for the RHII coil cannot be offered on the NP-G series because it was never tested in a LOCA type event. ASCO can now offer 2 qualified quick-disconnect connectors already molded into the RedHat II coil system

ASCOTM NP-G/H Series Conduit details


Clip will be bent to avoid damage

to the red nameplate. Same High

shock clip used on the legacy NP

series valves and NT series

nuclear values

NP-G/H series valves will secure

the coil to the solenoid operator

with High shock clip, instead of

the plastic RedHat clip used on

commercial

NP-G/H series valves will have a

red nameplate instead of green

or black for commercial

Commercial NP-G/H Series

Catalog Codification

ASCOTM NP-G/H Codification Change


Codification change

ASCO is currently updating our catalog numbering due to business systems changes to a 15 digit system.

ASCOTM will provide catalog number comparison tables for all of the NP to NP-G/H series valves.

The series & item numbers remain the same, but the revision level is now G (or H) for the series, IENP8316A054E now becomes 8316H054D0E0N

ASCOTM NP-G/H Codification Change

Below is a sample of some of the catalog number comparison charts in the qualification report.


This will be available for all of the NP series catalog numbers currently listed in our nuclear catalog.

Qualification

Life Comparison

ASCOTM NP-G/H Thermal Life

The primary advantage of the RedHat II coil system to nuclear customers is the thermal conductivity of the new coil system isbetter than the varnish and large metal housing. This results in reduced internal coil temperature and reduced component temperature that results in greatly increased thermal life.


Where:

T1 = Normal service temperature (°K) based on plant’s calculated or

observed conditions.

T2 = Accelerated aging temperature (°K) based on heat rise charts

(Appendix F)

t1= Normal service time (hours)

t2= Accelerated aging time (hours) based on original qualification data.

Ø = Reaction Activation Energy (eV) – Section 4 of this appendix

k = Boltzmann’s Constant (0.8617 x 10 -4 ev/°K)

Comparison based on 50°C ambient with 8316 & 8320 valves as examples

Comparison is for different coil & PV elastomer

Coil: RH II vs. RH I

PV: G/H Series vs. Legacy

Elastomer: EPDM & FKM

Nuclear 8316 Valves


Legacy PV life

AC DC material AC DC AC & DC

15 2 1 EPDM 11 9 4

15 2 1 FKM 12 10 8

PV (pressure vessel_ Life (years)

8316G054/G064 3/8" &1/2" NPT

Catalog # Pipe SizeRH II MXX coil life

(years) AC & DC

RH I coil life (years)

RH

II C

oil

AC

& D

C

RH

II C

oil

AC

& D

C

RH

I co

il A

C

RH

I co

il A

C

RH

I co

il D

C

RH

I co

il D

C

PV

G s

erie

s A

C

PV

G s

erie

s A

C

PV

G s

erie

s D

C

PV

G s

erie

s D

C

PV

Leg

acy

AC

& D

C

PV

Leg

acy

AC

& D

C

0

2

4

6

8

10

12

14

16

1 2

Life

(Ye

ars)

PV Elastomer

8316 Life comparison (at 50◦C ambient)

RH II Coil AC & DC RH I coil AC RH I coil DC PV G series AC PV G series DC PV Legacy AC & DC

EPDM PV FKM PV

Nuclear 8320 Valves


Legacy PV life

AC DC material AC DC AC & DC

15 2 1 EPDM 9 7 4

15 2 1 FKM 15 11 78320 Gxxx 1/4" NPT

Catalog # Pipe SizeRH II MXX coil life

(years) AC & DC

PV (pressure vessel_ Life (years)RH I coil life (years)

RH

II c

oil

life

AC

& D

C

RH

II c

oil

life

AC

& D

C

RH

I co

il A

C

RH

I co

il A

C

RH

I co

il D

C

RH

I co

il D

C

PV

G s

erie

s A

C

PV

G s

erie

s A

C

PV

G s

erie

s D

C

PV

G s

erie

s D

C

PV

Leg

acy

AC

& D

C

PV

Leg

acy

AC

& D

C

0

2

4

6

8

10

12

14

16

1 2

Life

(Ye

ars)

PV Elastomer

8320 valve life comparison ( at 50◦C ambient)

RH II coil life AC & DC RHI coil AC RHI coil DC PV G series AC PV G series DC PV Legacy AC & DC

EPDM PV

FKM PV

8300/8342 DC

Series Update

NP-G 8300 Series DC Valve Update


• For 8300/8342 DC series ASCO only there would have a been a reduction in pressure rating from the RHII system.

• ASCO reviewed the reduction in pressure and determined it would have been unacceptable to ASCO & our customers.

• The legacy series will remain available. Updates to the 8300/8342 DC series will be done at a later date.

• The rest of the NP-G/H series including the 8300/8342 AC series retains the same pressure rating and performance.

Reduces from 200 psi to ~80 PSI





• Increased qualified life by moving to ‘G/H’ series valves with RHII

epoxy coil. (DC) or (AC) Due to Reduction in Coil Operating

Temperatures

• ASCO has over 30 years of experience with the RHII epoxy coil, it’s a

proven replacement to the RedHat I solenoid system

• Drop-in replacement, same elastomers, same3/4’’ conduit connection.

Same mounting configurations, same or reduced wattage, same

pressure rating

• Qualification report (AQR-100368) will include comparison tables,

comparison specifications and calculated thermal life graphs with

updated heat rise tables

• Explosion proof is replaced with thermal fuse & screw terminal is

replaced with QDC options

• Will be available starting January 2018

Questions from Utilities

New ASCOTM BWR Scram & Directional Control Valve


The valve will last longer

than any LED

Therefore the screw-in LED

module is hot field

replaceable in less than 30

seconds

New ASCO NT SSPV with

LED power indicator Changes weekly thermal imaging

of valves to quicker visual

inspection

LED power indicator is

available on the DCV. • Stop by our booth for more information about this and others

NT SSPV with LED option DCV with LED option

ascotm‘s np operating experience

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